PB1-F2 enhances neutrophil recruitment in the lungs.

<p>(A) Mice were infected with 1x10⁵ PFU of the wt or the ΔF2 IAV and neutrophil count was done in the BAL fluids of mock-infected (n = 5), wt-infected (n = 9) or ΔF2-infected (n = 9) mice at day 3 pi. (B-C) Mice were intranasally instilled with LPS or full-length PB1-F2 (50pmol) from WSN strain or from a highly pathogenic H5N1 avian strain. 24h later mice were euthanized, KC secretion (B) and neutrophils recruitment were quantified within BAL fluids (C).